Boiler



(No Model.) 2 Sheets-Sheet 1.

0. Pa MARSHALL. BOILER.

No. 462,718. Patented Nov. 10,1891.

(No Model.) 2 Sheets-Sheet 2.

0. P. MARSHALL. BOILER.

No. 462,718. Patentd Nov. 10,1891.

we moms ravens co., mn'rmumo WASNIMUTSN, u. c.

' of Tennessee, have INITED STATES PATENT OFFICE.

CHARLES P. MARSHALL, OF MEMPHIS, TENNESSEE.

BOILER.

SPECIFICATION forming part of Letters Patent No. 462,718, dated. November 10, 1891. Application filed December 23, 1890- Serial No. 375,590. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES P. MARsHALL, a citizen of the United States, residing at Memphis, in the county of Shelby and State invented certain new and useful Improvements in Boilers, of which the following is a full, clear, and exact specification.

My invention consists in certain features of novelty hereinafter fully described in connection with the accompanying drawings, which form part of this specification, and more particularly pointed outin the claims.

In the said drawings, Figure I is a vertical section of the preferred form of my improved apparatus. Fig. II is a horizontal section taken on the line II II, Fig. I. Fig. III is a detail view hereinafter described. Fig. IV is a vertical section of a modified form.

Like signs of reference refer to like parts throughout the several views.

1 is the fire-box, having any suitable grate2 and fire-door 3, whose side walls are composed of plates 4, constituting the inner wall of an annular water-leg 5, and secured to the upper ends of these plates is a crown-sheet 6, which constitutes the upper side of the fire-box. Arranged above this crown-sheet is a smokesheet 7, which is of larger diameter than the crown-sheet, and which is secured at its periphery to the inner wall 8 of a combustionchamber 9. This combustion-chamber has communication with the fire-box through ascending fire tubes or flues 10, whose upper and lower ends are expanded or riveted in the saidsmoke-sheet 7 and crown-sheet (i, respectively. The lower ends of the plates at are connected by means of an annular or ring-shaped plate 11 to the exterior boiler sheets or plates 12, which extend upward within a short distance of the smoke-sheet 7, where they join with a flaring ring 13, and this ring is surmounted by plates 14, which latter, together with an annular top plate or ring 15 and the wall 8 of the combustion-chamber, forms a steam space or dome 16.

Suitably secured to the wall 8 of the combustion-chamber, at a suitable distance above the smoke-sheet 7, is an annular flange 1'7, and upon this flange is removably seated a feed-water-heating chamber 18. This chamber 18 is preferably composed of a side ring 19 and inwardly dished top and bottom plates 20 and 21, respectively. The plates of this chamber are dished or ooncaved for a twofold purpose: first, for the sake of the great strength that such a formation aifords, and, second, for causing the products of combustion as they ascend through the firetubes 10 to be deflected downward again toward the outer edge of the smokesheet 7, so that such products will readily pass from the combustion-chamber through descending flues 22. These flues 22 are preferably larger in diameter than the tlues 10 and arranged vertically within the water-space of the boiler at suitable intervals apart and have their upper and lower ends expanded or riveted in the smoke-sheet 7 and bottom ring or plate 11, respectively. The boiler proper that is to say, the steam dome or space 16 and the water-space surrounded by the exterior boiler-plates 12-is provided with a casing or jacket .3, which completely encompasses it and preferably follows its exterior contour, there being a slight space between it and the sides of the boiler proper for the upward passage of the products of combustion to the stack 24:, mounted on the top of the casing. This casing also extends downward below the water-leg 5, and the walls or plates 4 of the fire-box extend down an equal distance and form with the casing the breeching or smoke box 25, into which the descending lines 22 empty. The products of combustion upon entering the said breeching immediately be- .gin an upward course between the exterior boiler-plates and the casing 23, and in such upward course they directly impinge the under side of the flaring ring 13, heating it to an intense degree, and then pass on and envelop the steam-dome, and finally exit rid the stack. The feed-water-supply pipe 26, provided with suitable cheeks and cooks, has a branch 27, leading direct-lyinto the water-leg 5 and adapted to admit water thereinto when desired by turning the cook 28, and it also has a branch 29, which extends upwardly and then horizontally through the boiler-plates and casing and communicates with the chamber 18 for supplying water to the latter to be heated preparatory to its admission into the boiler proper. The feed-water leaves the chamber 18 via pipe 30, which likewise passes through the boiler-plates and casing and then descends to a lower level, where its end dips into a vertical tubular mud-drum 31, the upper part of which latter is provided with a valveguarded pipe 32,1eading into the waterleg 5. The lower end of the mud-drum is preferably made cylindrical, so that the sediment may be readily blown off through the blow-off pipe 33, and this blow-off pipe 33 is preferably connected by pipe 34 with the bottom of the boiler, as shown in dotted lines in Fig. I, so that sediment in the latter also may be removed. The horizontal portion of the pipes 29 pass through short tubes 35, expanded in the plates 8 14. The tubes 35 thus serve as stay-bolts for sustaining the walls of the boiler and at the same time form convenient means for the passage of the pipes 29 30 to the chamber 18fand prevent the steam or hot water in the boiler from coming into contact with the said pipes and thereby being condensed or chilled. The top plate 15 and side plates 12 may be provided at suitable intervals with any desirable and suitable form of hand-holes 36 for aitording easy access to the interior of the boiler for cleaning, inspecting, &c., and the chamber 18. may also be provided with similar hand-holes 37 for a like purpose, and I prefer to provide such chamber also with a central hand-hole 38, formed by expanding a ring 39 in its top and bottom plates, and having a suitable cover or lid 40, whereby the parts may be cleaned and access to the chamber below may be had without the necessity of removing the chamber 18. I prefer to make the chamber 18 of such size that it will fit the walls 8 of the combustion-chamber, and thus shut off communication between the fire-box and stack, excepting via the return or descending fiues 22 and easing; but it will -of course be understood that the bottom plate 21 only need be equal in diameter to that of the combustion-chamberin order to accomplish the said result, and that the said chamber 18' therefore might be of smaller relative diameter withoutdeparting'materially from the spirit of my invention; but it is of course advantageous, forobvious reasons, to have the superficial area of this chamber as large as possible. The plates or walls of the boiler and also the plates of the chamber 18 may be braced or re-enforced where convenient and desirable by any suitable number of tie bolts or rods 41, having their ends riveted or otherwise secured thereto. however, I prefer to employ, instead of the solid tie-rods, short tubes or pipes 41, which have their upper and lower ends expanded or riveted in the plates of the said chamber, as shown in Fig. I, and which, while they serve the same purpose as the solid rods 41, also facilitate in blowing out the tubes and flues 1O 22. For this latter purpose the tubes 41 are preferably equalin number to the number of tubes and flues 1O 22 employed, so that any suitable steam-nozzle (not shown) may be inserted in the upper ends of the tubes 4N, and discharging downward blow the soot from the tubes and flues below into the smoke-box and fire-chamber, from whence it may be re- In the chamber 18,

moved, and to make the force of the steam more eifective the tubes 41 are arranged so as to be coincident with the tubes and flues 1O 22. The upper ends of the tubes 41 are normally closed by means of a plate 41"-,Fig. III, which is provided with a central opening 0 to admit the cover 40 and openings d for the admission of the, hand-hole mechanism. It may also be provided with lifting-rings c. It is intended that the water-line shall be maintained at a point above the chamber'lS, as shown; but this of course may be varied in the discretion of the operator.

In the modified form of my device illustrated by Fig. IV the construction is the same as that already described, with the exception that thewater-space through which the tubes 10 pass and such tubes are omitted, thus leaving the chamber 18 to compose the'crown of the fire-box as well as that of the combustionchamber. This form also differs from the other, in that the chamber 18 is. provided with solid tie-rods 41, and consequently has not the cover-plate 41 but, if desired, the chamber 18 in this form also may be constructed like that in the other form. This latter arrangement answers the purpose when the apparatus is constructed on a smaller scale.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent- 1. The combination. in a steam-boiler, of the fire-box, the boiler proper surrounding said fire-box,the stack or uptake, afeed-waterheating chamber surrounded bythe boiler proper and arranged before the steam-space thereof and closing communication between said fire-box and stack, and return smokefluesleading from under said feed-water chamber and communicating with the stack, substantially as set forth.

2. The combination, in a steam-boiler, of the boiler proper, the fire-box surrounded by said boiler proper, the stack, a feed-waterheating chamber surrounded by said boiler proper and arranged before the steam-space thereof and closing communication between said stack and fire-box, and smoke-flues leading from under the feed water chamber through the boiler proper and communicating with the stack, substantially as set forth.

3. The combination, in a steam-boiler, of the fire-box, the stack, a feed-water-heatingchamber arranged between said fire-box and stack, a steam and water chamber surrounding the said feed-water chamber and forming a combustion-chamber between the said latter chamber and fire-box,flues connecting the fire-box with said combustion-chamber, and fiues passing through the steam and water chamber and connecting said combustionchamber with the stack, said feedwater chamber being arranged below the top of said steam and water chamber, substantially as set forth.

4. The combination, in a steam-boiler, of h the fire-box, the stack, the boiler proper surrounding said. fire-box and having a combustion-chamber formed within its walls at its upper end, smoke-fines leading from the lirebox through the boiler proper into said combustion-chamber, a chamber arranged in said combustion-chamber above said fines and below the upper end of the boiler proper and having communication with the said boiler proper and closing communication between the stack and fire-box, and fines extending through the boiler proper and communicating with the combustion-chamber and stack, substantially as set forth.

5. The combination, in a steam-boiler, of thefire-box, the boiler proper surrounding said fire-box and having a combustion-chamber formed within its water-walls at its upper end, fines extending through the said boiler proper to said combustion-chamber, and an independent chamber arranged in said combustionchamber above said fines and having communication with the boiler proper, said independent chamber having inwardly-dished top and bottom plates, substantially as set forth.

6. The combination, in a steam-boiler, of the fire-box, the boiler proper having a combustion-chamberformed Within its water-walls in its upper end, fines connecting said fire-box and chamber, a flange secured to the inner wall of said combustion-chamber, a removable feed-Water-heating chamber supported upon said flange and having communication with the boiler proper and closing communication between the fire-box and stack, and flues extending from the combustion-chamber through the boiler proper and communicating with the stack, substantially as set forth.

7. The combination, in a steam-boiler, of the firebox, the boiler proper having a combustion-chamber, a feed-water-heating chamber supported in said combustion-chamber and having inwardly-dished top and bottom plates, and return-flues leading from under said bottom plate, substantially as set forth.

8. The combination, in a steam-boiler, of the fire-box, the boiler proper having a combustion-chamber, a feed-water-heating chamber arranged in said combustion-chamber and having a supply-pipe, the mud-drum arranged above the bottom of the boiler and being connected with said feed-water chamber and with the boiler proper, a pipe having cocks connected with the bottom of said drum, and a second pipe connected to said first pipe and to the bottom of the boiler proper, substantially as set forth.

9. A boiler having an open chamber formed within and surrounded by the water-walls of the boiler, in combination with a removable feed-water-heating chamber arranged within said chamber, and the ascending anddescending fire-fines extending through the waterspace of the boiler and having their ends arranged under said feed-water-heati n g chamber, substantially as set forth.

l0. Aboilerhavingan open chamber formed within and surrounded by the water-walls of the boiler, in combination with a removable feed-\vater-heating chamber having the hole 38 therethrough arranged in said chamber and forming the top of the combustion-chamber, and a lid for closing said hole 38, substantially as set forth.

11. The combination, in a steam-boiler, of the fire-box, the boiler proper having a combustion-chamber formed therein, a feed-water-heating chamber arranged in said combustion-chamber, stay-tubes 35, forming passages through the boiler proper into the C0111- bustion-chamber, and the feed-water-supply pipes passing through said tubes to the feedwater chamber, substantially as set forth.

12. The combination, in a steam-boiler, of the boiler proper, the fire-box formed in one end of the boiler proper, a combustion-chamber formed above said fire-box in the other end of the boiler proper within the walls of the chamber 1 G, fire-tubes leading from the firebox through a portion of the water-space of the boiler proper and communicating with the combustion-chamber, the stack, a feed-waterheating chamberarranged in said combustionchamberand closing communication between the stack and fire-box, and the smoke-box or .breeching arranged at the lower end of the boiler proper and communicating with the stack and fines, descending from under the feed-water chamber through the boiler proper, and emptying into the said smoke-box, substantially as set forth. 4

13. The combination, in a steaurboiler, of the boiler proper having a fire-box in its lower end and a combustion-chamber in its upper end surrounded by the annular steam and water chamber 16, an independent feed-waterheating chamber forming the top of the combustion-chamber, the casing enveloping the boiler and having a stack at its top, a smokebox at the lower end of the boiler proper co1n-. munica ting with the casing, and fluesleading from the combustion'chamber through the water-space of the boiler to said smoke-box, substantially as set forth.

14:; The combination, in a steam-boiler, of the boiler proper, a fire-box located within the boiler proper at one end, a chamber formed within the walls of the boiler proper at its other end and having an open top, said boiler proper having a WttGFSPELOG between the fire-box and said chamber, fines extending through said space and connecting said chamber and box, a feed-water-heating chamber arranged in said first chamber and forming the top of a combnstion-chamber, and smoke-fines leading from said combustionchamber, substantially as set forth.

CHARLES P. MARSHALL.

\Vitnesses:

DAN SHEA, \V. B. WEIsIonn.

IIO 

